chore: update polaris peer deps to 12

Author: mathiusj

package.json

@@ -70,7 +70,7 @@
   "peerDependencies": {
     "@shopify/app-bridge": "^3.7.7",
     "@shopify/app-bridge-react": "^3.7.7",
-    "@shopify/polaris": "^11.19.0",
+    "@shopify/polaris": "^12.0.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },